I'm not sure "false justifications" is the right term, but it's the closest I can think of. I'm referring to a situation in which a person has already made up his mind for reasons he won't publicly disclose, then tries to justify using specious excuses that don't hold up under scrutiny.
For example, let's suppose a new manager wants to fire an employee for reasons that would be illegal. Instead, he comes up with a laundry list of legal reasons (tardiness, improper dress, poor attitude, lack of productivity). Taken as a whole and unexamined, the list seems overwhelming and thus the dismissal justifiable. But if given the opportunity, the employee could refute each reason individually (has never actually been late, dresses the same as others in the office, is meeting all quotas and agreements, etc).
Similarly, in political conversations a person's argument may be based on a conclusion driven by passions and beliefs, but not data. Then data is cherrypicked to prove the argument rather than forming an argument based on the data.
I'm looking for ways to describe this sort of pre-determination. Is there a language for this?